Inking apparatus for aniline color printing machines



y 1941- I a DIE TRICH 2,240,762

' INKING APPARATUS FOR ANILINE COLOR PRINTING MACHINES Filed Jan. 11,1939 Patented May. 6, 1941 s]; PATENT OFFICE -r" i i :1 Nrrrnenrm:t:;:::uNmmE down I I rnm'rmo moms Paul Dietrich, Augsburg, Germany,assignor to Maschinenfabrik Augsburg-Number A. G., Augsburg,incorporation of Germany Application January 11,1939, Serial No. 250,297

' Germany-Imam 12, 1938 The inking apparatus for aniline color printingmachines comprises as a. rule a dipping roller which co-operates witharoller squeegee. -.Th*c

dipping roller may atth'e same time operates an inking roller, or' aseparate. inking *roiler may 7 be provided. I I Apparatus of thisdescription have th e,'disad-:

The drawing shows schematically a preferred embodiment of the invention.

The highly fluid aniline printing ink contained in the ink duct ladheres to the dipping vantage that thequantity or inkgdeiiositeduponthe form varies with the speed of the machine since: it depends onthefunction of the .roller' squeegee. The roller squeegee consequently hasto be adjusted anew at every change of speed to ensure the delivery ofthe required proper amount of ink in each case. At the very high speedofmodern quick running machines the roller squeegee can no longersatisfactorily w squeeze off the surplus ink onthe dipping roller.According to the invention these disadvantages are avoided by suitablyalteringthe surface of the dippingroller, forinstance byetching into itan intagl'i'o printing screen and provide a socalled doctor for rakingoff the surplus ink.-. An-

inking transfer roller then lifts the ink from out of the depressions oithe dipping roller surface and transfers it to the plate cylinder. In.addi tion the inking roller is preferably furnished with a separateroller squeegee, for flattening down the .particlesof ink. lifted fromout of the in-, dividual' cavities of the dipping roller surface,

- and so produces an [evenly thin film of ink con ducive to the finestand most exact inking of the plate cylinder. Instead of charging theroller by the roller dippinginto the ink duct'containing the anilineprinting ink, that. is by a dipping process. an ink pump, as is usual inrotary pho roller 2 into the surface of-which an intaglio 1 screen isetched. A doctor 3 of any suitable character removes the surplus inktherefrom.

As the depth of the cavities is everywhere exact ly alike, an exactlimitation of the thickness of the film of ink results. The screeneddipping roller transfers the ink to a rubber roller l and before thisretransfers the ink to the plate cylinder 5, the ink is further evenedout by a roller squeegee G. In this manner an extraordinarily thin andperfectly even film of ink may be obtained on the inking roller for thefinest and most exact inking of the plate cylinder.

What is claimed is:

" In an inking apparatus for aniline color printing machines, incombination, an ink con- .taine'r, a roller dipping thereinto and havingan intaglio surface of even depth etched thereon, a doctor for scrapingsurplus ink from the dipping roller, 8. rubber roller operable incontact with said dipping roller and adapted to receive the ink from thedipping roller at a location following said doctor, a printing memberoperable in contact with said rubber roller, and a smooth surfacedsqueegee roll cooperating with said rubtogravure machines, may be used.p a

ber rollerfor smoothing the ink supplied to the rubber roller before theink is transferred to the printing member.

PAUL DIE'I'RICH.

